Heat-radiator.



0. SONNEBOR'N.

HEAT RADIATOR.

APPLICATION FILED lAN.22. 1916. LZGQ@ Patented May 15, 1917.

' 2 SHEETS-SHEET l.

NvEN-ron WTNESSE C. SONNEBORN.

HEAT RADIATOR.

APPLICATION FILED IAN.22. Isls.

1,226,129. Patented May1551917.

2 SHEETS-SHEET 2.

CHARLES SONNEBORN, OF WEST PITTSBURGH, PENNSYLVANIA, ASSIGNOR T0 PRESSED METAL RADIATOR COMPANY, OF PITTS OF PENNSYLVANIA.

BURGH, PENNSYLVANIA, A CORPORATION HEAT-RADIATOR.

Specification of Letters Patent.

Patented May 15, 1917.

Application led January 22, 1916. Serial No. 73,763.

To all whom t may concern.'

Be it known that I, CHARLES SoNNnonN, a resident of West Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and/useful Improvement in Heat-Radiators, of which the tollowing is a specification.

This invention relates to heat radiators, p and more particularly to heat radiators designed for use as transformer coolers.

The coils of large electrical transformers are usually immersed in a bath of oil to `prevent short circuits and'by radiating to the atmosphere the heat generated in the transformer, to also protect the coils from injury. The object of this invention is to provide a cheap andl eiiicient form of cooler,

one which can compete with prior coolers built up of ordinary pipe and pipe fittings or other. prior devices; one which is of light weight, is entirely leakproof and has a lesser number of joints or connections than prior coolers of this class; one which can be readily built up to any desiredsize or amount of radiating surface;l and one which can be operated with a proportionately small quantity of oil bath and is constructed to provide a large exposed surface area with thin columns of liquid so that the heat of the oil is quickly, thoroughly and etciently radiated to the air.

Further objects of the invention are in part obvious and in part will appear more in detail hereinafter. f

The invention comprises the construction 'and arrangement of parts hereinafter described and claimed.

In the drawings, Figure 1 represents a sectional elevation of one form of cooler embodying the invention; Fig. 2 is a plan view thereof; Fig. 3 is an enlarged elevation partly in section of one of the radiator members; Fig. 4 is a detail end view from the left in Fig. 3; Fig. 5 is a cross section on the line 5-5, Fig. 4; and Fig. 6 is a detail sectional view on the line 66, Fig. 4.

The cooler shown in the drawings comprises a tank or reservoir 1 containing the oil bath, which is maintained at a levelindicated by the dotted line AA. This tank is provided with a ledge or series of projec tions 2 near its upper end serving as supports for the primary and secondary coils of a transformer shown by dotted lines at 3 andwhich is provided with projections 4 resting upon' the projections 3 to support the coils immersed in the oil bath.

The heat generated by the coils is trans mitted to the atmosphere by circulating the oil bath through a series of radiator-S5, which are of special form and construction, enabling them to be made and assembled with the tank at low cost, and which also are of' light weight, have maximum efiiciencyV and are substantially leakproof.

The reservoir l is provided nearits top and bottom with two series of openings 6 arranged in pairs vertically alined, one of said radiators communicating `at its header ends with the a-lined openings of a pair.

Each radiator comprises one or more units or sections eachl of which consists of one or a plurality of hollow header sections 7 and a plurality of comparatively thin walled rolled or drawn metal tubes 8 communicating therewith. iThe header sections may be of various forms, depending upon circumstances, such as the size of the tank or reser- Voir and the number of tubes and amount of exposed radiating sur-face desired.` Each header section shown is of hollow cast metal with a central portion 9 having threaded openings 10 in its opposite faces, and laterally extending Wings 11, the cavities in which communicate with the openings 10. On one side of the header section its wall 12 slopes of in both directions to the ends of the wings 11, while the opposite' side is straight from end to end, being broken by the shallow transverse grooves 13 between adjacent hollow bosses 14 spaced thereon.

The header sections may be made of any suitable metal, preferably malleable iron castings, although castings of alloys, aluminum, brass, bronze or ordinary castiron are suitable. Malleable iron is preferable due to its low cost, its homogeneous composition and textureY and its usual freedom from blowholes. The header sections are made as light as possible with due regard for strength. Any number of hollow bosses 14 maybe provided on each header section, so as to enable the radiator unit to include any deand t also give a minimum`- ldiameter of the liquid column im the tube so that the center of the column is nearer to the air than in a round or other form of tube. The ends of the tubes are cut ofi' square and are secured to the header sections preferably by welding or brazing so as tosecure a perfect seal and guard against leakage or loss of oil.

For the tubes any f thin wrought metal pipe which is of light weight and is impervious to oily liquid is suitable. Said pipes may be made of any metal, for example, copper, bronze'or the like, but preferably are formed of wrought iron and may be commercially rolled or drawn tubing, seamed or seamless and of flattened or oval or of oblong form, as before described.

As stated, any number, of tubes 8 may be usedto vconnect the two header` sections of a given radiator unit, so that only4 one tube may be used if desired, although the drawings, for purposes of illustration, show three tubes connecting each pair of header sections. Said three tubes are shown as in the same plane, but the number may beincreased by including more tubes inthe same plane, or by locating the tubes connecting header sections in parallel rows of say two, three or more each. Furthermore, with any 3e form of radiator unit, the radiator may be j may be removed in case the joints between built up to any desired size,` thereby providing for any amount of exposed radiating surface. This is accomplishe' by connecting a series of radiator units or sections to each other to form one ofthe radiators 5, the drawings showing four se\ctions or units in each radiator. The several units or sections are connected by right-and left-hand threaded nipples 16, which are threaded vinto the opening 10 ofthe header sections,

the joints being made tight, if desired, by a lead or other soft metal Washer 17 inserted between radiator sections. The outer section or unit of the radiator has its outer holes 10 closed by suitable plugs 18, which radiator sections leak to enable them to be tightened up by a tool inserted through the holes 10.

lEach radiator isconnected to the tank or reservoir 1 by right and left-hand nipples 19 threaded..V into the openings 1,0 of the in- -ner radiator unit or section and into an opening 6 of the'tank or reservoir, which, for this purpose, is provided with flanged litting 20 to receive said nipple, and which t ting is welded or brazed to the tank wall around said opening. Preferably, also, the threaded connections at both ends of the copies o! this patent may be obtained for nipples 19 will be closed or sealed by Welding or brazing after assemblage to insure tight joints and prevent leakage.

Vhile the inventionl has been shown applied for use as a transformer cooler it is to be understood that it is not so restricted but is capable of other uses. For example, the tank or reservoir with the radiator sections applied thereto may be used for holding and cooling oil baths for quenching metals during heat treatment or for cooling other substances than oil.

The radiators, formed of one or more sections or units as described, are spaced around the periphery of the oil reservoir, as shown in Fig. 2. The thin Walled tubes largely increase the ability to quickly transmit the heat and so reduce the cross section of the liquid columns as to largely increase the efliciency. The joints are all tight and the construction is not only strong but also entirely prevents loss of oil by leakage.

This form of radiator enables a very large exposed surface area to be secured with a minimum volume of liquid in the tank so that the first cost of installation of the tank, radiator and oil bath is a minimum. The cost of upkeep is also 4low due to the tight joints and the high efficiency.

What I claim is n 1. A heat radiator, comprising a tank or reservoir for containing a liquid, and a se' 4top and bottom, and a series of radiators spaced around said tank, each radiator comprising a plurality of units each embodying hollow metal sections and a plurality of metal tubes welded or brazed thereto, in ternal connections for the units of said ra diators, and nipples connecting said radia tors to the tank.

In testimony whereof, I have hereunto set my hand.

CHARLES SONNEBORN.

n Witnesses:

` H. M. WATKINs,

W. L. BROADBENT.

ve eentseaeh, by addressing the ommissioner o! Patents, Washington, D. c, 

